Silence compilation warning about SecureTransport being deprecated

We know it's deprecated, and have a bug report to track it, so we don't
need a compilation warning on each build.

Task-number: QTBUG-119171
Change-Id: Iea9e45ae154761efb0960acf34a79953518024c1
Reviewed-by: Timur Pocheptsov <[email protected]>

Author: torarnv

src/plugins/tls/securetransport/qtls_st_p.h

@@ -27,9 +27,9 @@
 #include <QtNetwork/qabstractsocket.h>
 #include <QtNetwork/private/qsslsocket_p.h>
 
-#warning SecureTransport was deprecated in macOS 10.15 and iOS 13, \
-and is no longer supported. We should be using Network.framework instead. \
-See QTBUG-85231 for more information.
+// SecureTransport was deprecated in macOS 10.15 and iOS 13, and is no
+// longer supported. We should be using Network.framework instead.
+// See QTBUG-119171 for more information.
 QT_WARNING_DISABLE_DEPRECATED
 
 #include <Security/Security.h>